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THEORETICAL DIVE DEPTH (fsw) AT VARIOUS ALTITUDES (in feet)
Sea Level	1,000'	2,000'	3,000'	4,000'	5,000'	6,000'	7,000'	8,000'	9,000'	10,000'
0	0	0	0	0	0	0	0	0	0	0
10	10	11	11	12	12	12	13	13	14	15
20	21	21	22	23	24	25	26	27	28	29
30	31	32	33	35	36	37	39	40	42	44
40	41	43	45	46	48	50	52	54	56	58
50	52	54	56	58	60	62	65	67	70	73
60	62	64	67	69	72	75	78	81	84	87
70	72	75	78	81	84	87	91	94	98	102
80	83	86	89	92	96	100	103	108	112	116
90	93	97	100	104	108	112	116	121	126	131
100	103	107	111	116	120	124	129	134	140
110	114	118	122	127	132	137
120	124	129	134	139
130	135	140
The Imperial version of the Altitude Chart appeared in Skin Diver magazine 1970 It is based on an approximate 4% correction per 1,000 feet altitude

THEORETICAL SAFETY STOPS (fsw) AT VARIOUS ALTITUDES (in feet)
Sea Level	1,000'	2,000'	3,000'	4,000'	5,000'	6,000'	7,000'	8,000'	9,000'	10,000'
15	14	14	13	13	12	12	12	11	11	10

Please Review the Rules for Diving After Arriving at Altitude Remember the Rules for Travel to Altitude After Diving
Santa Rosa Blue Hole 4,595´	Heron Lake 7,157´	Clines Corners 7,150´	Balmorhea, TX 3,205´
Atmospheric pressure at 5,000 feet is approximately 850 mb and at 10,000 feet it is approximately 700 mb

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